Index: src/wp-includes/css/media-views.css
===================================================================
--- src/wp-includes/css/media-views.css	(revision 29014)
+++ src/wp-includes/css/media-views.css	(working copy)
@@ -1082,6 +1082,7 @@
 
 .attachments-browser.hide-sidebar .attachments {
 	right: 0;
+	margin-right: 0;
 }
 
 .attachments-browser .instructions {